Antifriction bearings in split motors



April 2.9,' 1924; 1,4;9z,1os1

SCHULZ Nrrf'uzcmn Bmmes In smi? morons Filed neg, 3.19.- laas Patented Apr. 29, 1924i.

UNITED s'rarssE P ATE NT OFFIC E..

JOHANNES SCHULZ, OF ELBERFELD, GERMANY, ASSIGNOR TO THE FIRM G. & J'. JAEGER, AKTIENGESELLSCHAFT, OF ELBERFE'LD, GERMANY.

ANTIFRICTION BEARINGS IN SPLIT MOTORS.

Application led December 19, 1923.

Y '0 all whom it may concern:

Be it known that I, JOHANNES SCHULZ, a citizen of Germany, residing at Elberfeld, Germany, have invented certain new and useful Improvements in Antifriction Bearings in Split Motors, of which the following is a specification.

Antifriction bearings in split railway motors have heretofore been mounted in bea-ring housings, which were attached, by means of horizontal screws in the upper and lower halves of the motor frame.

In view of the fact that the bearing loads, which were transmitted through the bearing ,15 housings to the two halves of the motor 'fr-ame, change their direction with the direction of rotation of the motor, forces occurred, which had the tendency to force the two halves of the motor frame apart. These two halves were therefore permanently subjected to a breathing motion, near said roller bearing housings, which would produce pulsating shearing stresses in the horizontal screws, holding the bearing housing against the frame. The threads of said screws would suer under these stresses to such an extent that they would loosen after a comparatively short period of service. It has therefore already been suggested to relievethese screws by means of ring shaped ribs in the bearing housings. It has however been found, that the latter, as well as the corresponding grooves in the split fra-me, lose their circular shape and the necessary rigid support of the armature is thereby jeopardized. This arrangement has the further drawback that, in case of necessary repairs, it is extremely diiiicult to remove the lower half of the motor frame or the armature, because the horizontal bearing housing screws are diicult to reach from the pit, par-- ticularly in the case of narrow gage railway cars, where the clearances are extremely limited. In such cases it is often necessary to remove said screws from the inside of the ca-r.

According to the invention, these drawbacks are all eliminated by the location of Serial N0. 681,481.

the antifriction bearing in the cylindrical housings, which are fastened to the upper half of the trame by means of vertical screws, which can easily be screwed in and locked from the pit, so that all loads, to which the antifriction bearings are subjected, are transmitted to said upper half of the frame.

Figure I of the drawing represents a longitudinal section through a split motor with such an arrangement of the antifriction bearings, while. GO

Figure II represents a cross section ot same.

The antiriction bearings are mounted in cylindrical housings l, which, in the pinion as well as the collector side, rest in bearing o5 supports 2 of the upper frame 3 and are held against said support by means of the bearing holder 4 which is rigidly screwed against thel upper half of the motor frame by means ot two vertical screws 5. The antifriction bearings have thus no connection with the lower halt1 of the frame and the occurring downward loads are transmitted exclusively to the upper half 6 of the motor frame through the screws 5.

For inspection of the motor from the pit, it is sufficient to loosen the vertical screws 7, in order to remove the lower half of the frame and to loosen the screws 5, in order to remove the armature and the roller bearings.

I claim:

1. In combination with a horizontal electromotor, a split frame comprising upper and lower portions, the upper portion projecting beyond the lower portion in a direc tion longitudinal with the armature shaft. and housings enclosing the bearings for the armature shaft and detachably secured to the projecting ends of the upper frame portion.

2. In combination with a horizontal electromotor, a split frame comprising upper and lower portions, the upper portion projecting beyond the lower portion in a direction longitudinal Awith the armature shaft, 95 and housings enclosing the bearings for the armature shaft and detaohably secured to the projecting end portions of the upper freine portion by vertical securing means.

3. In combination with a horizontal elec- 5 tromotor, a split frame comprising upper end lower portions, the upperportion pro? jeoting beyond the lower portion in a direction longitudinal with the armature shaft,

and housings enclosing the bearing.; lor the armature shaft and detaehably secured to the projecting ends of the upper frame portion and accessible without disturbing the lower frame portion.

In testimony whereof, I aix my, signature. i i.. l

JOHANNES SCHULZ. 

